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Date: Wed, 4 Jan 2012 16:13:39 +0000 (UTC)
From: "Gary D. Gregory (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (LANG-784) Strange behavior on
 StringUtils.difference
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    [ https://issues.apache.org/jira/browse/LANG-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179594#comment-13179594 ] 

Gary D. Gregory commented on LANG-784:
--------------------------------------

The Javadoc is clear IMO: 

{quote}
Compares two Strings, and returns the portion where they differ.
(More precisely, return the remainder of the second String,
starting from where it's different from the first.
{quote}

A piece of the 2nd String is always returned, in this case a piece of "".

Also note this example: 

StringUtils.difference("", "abc") = "abc"
                
> Strange behavior on StringUtils.difference
> ------------------------------------------
>
>                 Key: LANG-784
>                 URL: https://issues.apache.org/jira/browse/LANG-784
>             Project: Commons Lang
>          Issue Type: Improvement
>          Components: lang.*
>    Affects Versions: 3.0.1
>            Reporter: Arnaud BRUNET
>            Priority: Minor
>
> Hi,
> The behavior of the method StringUtils.difference () behaves in a non-intuitive (explain in the javadoc).
> StringUtils.difference ("abc", "") returns "" as intuitively expected to be "abc".
> Is it possible to change this behavior ?
> Regards,
> Arnaud

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